3.2.1. Coupling Coordination Degree among the PLEF

The coupling coordination degree and the spatial distribution map of the PLEF of Jiangjin District in 2018 were obtained through the coupling coordination degree model (Figure 3). The natural breakpoint classification method (Jenks) was used to divide the coupling coordination degree of the PLEF of the study area into three categories which can appropriately group similar values and maximize the difference between each grouping [52] (Table 2).

**Figure 2.** Evaluation value of the PLEF of Jiangjin District in 2018.

**Figure 3.** Spatial distribution of the coupling coordination degree of the PLEF of Jiangjin District in 2018.


**Table 2.** Classification and distribution of the coupling coordination degree of the PLEF.

3.2.2. Coupling Coordination Degree between Every Two of the PLEF

The degree of coupling and coordination and the spatial distribution map between every two of the PLEF of Jiangjin District in 2018 were obtained according to Formulas (5) and (6) (Figure 4). Moreover, we divided the degree of coupling and coordination between every two of the PLEF into three categories (incongruous zone, break-in zone and coordination zone) by using the natural breakpoint classification method. However, due to the differences in the degree of coordination between every two of the PLEF, the breakpoint value of the division interval was also different (Tables 3–5). In general, the degree of coupling and coordination between every two of the PLEF is generally spatially consistent and high in the north and low in the south.

**Figure 4.** Spatial distribution of the coupling coordination degree between the production-living, the production-ecological and the living-ecological functions of Jiangjin District in 2018.


**Table 3.** Classification and distribution of the coupling coordination degree of the production-living function (PLF) of Jiangjin District in 2018.

**Table 4.** Classification and distribution of the coupling coordination degree of the productionecological function (PEF) of Jiangjin District in 2018.


**Table 5.** Classification and distribution of the coupling coordination degree of the living-ecological function (LEF) of Jiangjin District in 2018.

